Thanks Scott, thanks the info I have been searching for. I have been debating with myself whether to make a permanent install or just use as a tuning tool as I have also heard sensor's have short lives in marine applications.
I ordered one of these https://www.michiganmotorz.com/o2-spacer-stock-mercury-riser-wet-joint
Will swap out one of my 4" risers for a 3" and the O2 plate. Which side runs hotter on a SBC?
I have been on the hunt for a manifold and I think I have one pinned down. Considering comments made about tuning and mostly concerned with a potential lean condition. I am considering a AFR gauge, maybe not a permanent install and maybe just one side. I can read plugs, however I thought this...
It really was, I learned a lot and enjoyed the work, in terms of dollars and time, there was no savings other than I could pay for parts as I needed them... Its been a great boat and set up well, my wife enjoys it and that means a lot. thanks, John
I ordered a new 5.7 long block from Michigan Motorz today, I considered the 6,2, however they did not have any in stock and did not have any rebuildable blocks as I considered a reman.
The 5.7 has the 062 heads and the 6200 has 906 heads with Iconel seats. I debated long and hard on that one as...
Thanks, it was quite the project, not what I had initially planned, but the Glasply is a good hull and it was a worth while project (5 years). Here is a link to the GP forum, haven't been on their much, it looks like I can now add pics to old posts, may do that...
Scott,
My Mistake as I thought the 325 HP Merc was based on a GM 5700, however I see now it is Merc product. I plan to order the 5700 next week and will use my accessories, including the 750 Weber and TB V.
Actual HP..... who knows.... maybe MM knows. I assume it will at least 315 as that is...
I will be using all my accessories, including my existing shift plate with shift interrupt. The base 5700 is the same to my understanding. As you ssid MM builds them for different applications. The only real difference is the 750 vs the 600 cfm carb, as I doubt the delco vs TB offers any...
I can use everything off of the existing motor, when I asked about the 6.2 the rep suggested the 315 hp with delco and 600 cfm carb, yet they offer a 325 hp version with a 750 cfm weber and T bolt ignition, makes me think he doesn't know the product very well. Probably all due to covid.
I have been talking to a Devin at Michigan Motorz, pretty helpful. Shipping will run about $825.00, checking on another carrier. Hoping they will forego the $250.00 core charge.
He suggested this motor...
I have read wave jumping is hard on the drive, I can honestly say I avoid, which has been easy as I have not found myself in those conditions. I also wonder if the San Juan HE is adequate to cool more HP....
Thanks makes a lot of sense, I figured I should be slightly underpropped with a new motor until I figure out where I need to be. The boat performs quite well with the existing motor, Is it safe to assume a new 5.7 Vortec would be the same or better... expecting better. Its great to cruise a 30...
Thanks guys, the boat is heavy, does OK with current power, more is always nice, running a Alpha 1 Gen 2 and should I be concerned about using the 6.2L with the A 1? Currently can cruise at 3200 RPM between 22 and 28 MPH depending on sea conditions. WOT is just under 40. Averaging about 2 -2.2...
1996/97 5.7LX A1 gen 2, closed cooling 0K158784
Severe blow by and time to to rebuild. ~ 580 hours on a rebuild (PO), not original block.
Had head issues last season and tuliped a valve, replaced all the intake valves. Compression and leak down test were ok and piston (#3) looked ok.
Not...
You Aussies got it made with 98 octane. !
Was there crap in the carb when you cleaned it the second time?
Did you blow out or replace the fuel lines?
Gasket probably went through the motor OK, not ideal but doubt its terribly detrimental.
Springy thing...hmmm? Accelerator pump? Or on the side...
Thats what I was wondering, does someone make a "holeless" gasket...?
Paint of course... ha, did touch it up while the intake was off. Rust never sleeps...
I made a mistake on the intake manifold and had a leak on the backside. Mostly due to the fact I was stingy on the "right stuff". However it did provide the opportunity to change out the head to manifold intake gasket.
I was in a time crunch and waiting for gaskets to come in that had been...
